The 3-arg QObject::connect() overload (the "contextless" one) simply
forwards to the 4-arg overload, using the sender object as both
the sender and the receiver/context.
QHostInfo does not use connect() directly in order to emit notifications
that a lookup is finished. Instead, it uses some of QObject private
plumbing. When handling a lookup request that specifies a function
to call when done, but no context object, QHostInfo passes nullptr
as context/receiver.
Change QHostInfoResult's behavior to always have a "receiver": in case
the caller didn't specify one, use `this` (= the sender).
As a drive-by, this allows to streamline some code.
Change-Id: Ic2e63ac18ba36269036950b6f6b7fecea51d0c99
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@qt.io>
797edbc58c